CN112234706A - Underground direct current power supply device and method - Google Patents
Underground direct current power supply device and method Download PDFInfo
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- CN112234706A CN112234706A CN202011130510.2A CN202011130510A CN112234706A CN 112234706 A CN112234706 A CN 112234706A CN 202011130510 A CN202011130510 A CN 202011130510A CN 112234706 A CN112234706 A CN 112234706A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 32
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 230000006641 stabilisation Effects 0.000 claims abstract description 16
- 238000011105 stabilization Methods 0.000 claims abstract description 16
- 239000000284 extract Substances 0.000 claims abstract description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/066—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems characterised by the use of dynamo-electric machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an underground direct current power supply device and a method, wherein the device comprises: the power supply module, the rectification filter module, the voltage stabilization control module and the battery module are connected in series; the power taking module extracts alternating current voltage from a stator winding of the motor and transmits the alternating current voltage to the rectification filtering module; the rectification filtering module converts the alternating voltage into direct voltage and transmits the direct voltage to the voltage stabilization control module; and the direct-current voltage output by the voltage stabilization control module and the direct-current voltage output by the battery module are transmitted to a load in parallel, so that the load is supplied with power uninterruptedly. On the basis of fully knowing the internal structure of the underground motor and the power supply requirement of the instrument, the invention combines the characteristic of the self electrification of the winding when the underground motor operates, selects to directly take power from the winding of the motor, can reduce the volume of a power device and reduce the cost due to lower voltage level, and supplies power to the underground instrument through the battery when the motor does not work, thereby realizing stable power supply with low cost and long time.
Description
Technical Field
The invention belongs to the technical field of underground power supply, and particularly relates to an underground direct-current power supply device and method.
Background
With the continuous improvement of the underground modernization level of the oil and gas field, sensors and control actuators used by underground logging tools and control tools are more and more, and the requirements on the reliability, safety and continuity of an underground power supply system are higher and higher. Currently, there are three main methods for powering downhole instruments:
firstly, the power is supplied by a battery. The battery is mostly high performance lithium cell, has advantages such as compact structure, simple to operate, nevertheless receives high temperature high pressure in the pit to influence, and duration operating time is shorter, can not satisfy the long-time demand of supplying power in succession of deep well gradually. The battery is frequently replaced under the condition of limited capacity, the cost is high, the working workload is large, and the safety problems of sealing leakage and the like exist.
And secondly, electric energy is transmitted to underground equipment by a cable. The long cable has the problems of voltage drop and loss in electric energy transmission, and the cost is high. Moreover, in the process of electric energy transmission, the cable is easily interfered by the ground type, and the reliability is poor.
And thirdly, supplying power to the underground turbine generator. And part of logging-while-drilling equipment adopts an underground turbine generator for power supply, so that the logging-while-drilling equipment is energy-saving and environment-friendly, has long service life and avoids the problem of battery exhaustion. But the turbine generator must be driven by drilling fluid or other media, and the application range is narrow.
Therefore, the existing underground direct current power supply device has the problems of high cost, poor reliability, limited application occasions and the like.
Disclosure of Invention
Aiming at the defects and improvement requirements of the prior art, the invention provides an underground direct current power supply device which is used for solving the technical problems of high cost, poor reliability and limited application occasions of the conventional underground direct current power supply device.
In order to achieve the above object, the present invention provides a downhole dc power supply apparatus, comprising: the power supply module, the rectification filter module, the voltage stabilization control module and the battery module are connected in series;
the power taking module extracts alternating current voltage from a stator winding of the motor and transmits the alternating current voltage to the rectification filtering module;
the rectification filtering module converts the alternating voltage into direct voltage and transmits the direct voltage to the voltage stabilization control module;
and the direct-current voltage output by the voltage stabilization control module and the direct-current voltage output by the battery module are transmitted to a load in parallel, so that the load is supplied with power uninterruptedly.
Further, when a stator winding of the motor is provided with a middle tap, the power taking module extracts alternating-current voltage from the middle tap;
when the stator of the motor is provided with two or more sets of windings and the windings are mutually and electrically isolated, the power taking module extracts alternating-current voltage from one set of windings.
Further, the rectification and filtering module comprises a rectification circuit and a filtering circuit, and the rectification circuit is an uncontrolled rectification circuit or a controllable rectification circuit or a semi-controllable rectification circuit; the filter circuit is an inductance-capacitance filter circuit and is used for filtering alternating current components in the rectified output voltage.
Further, the voltage stabilization control module comprises a voltage stabilizing circuit and a control circuit, wherein the voltage stabilizing circuit is a double-tube Buck-Boost circuit, and the control circuit adopts voltage and current double-loop control based on average current.
Further, the battery module is a high-temperature lithium battery or a lead-acid battery.
Furthermore, the output end of the battery module is connected with the load after being connected with a diode in series.
The invention also provides an underground direct current power supply method, which adopts the underground direct current power supply device and comprises the following steps:
when the motor works, the motor obtains electricity from a stator winding of the motor, and supplies power to the load after rectification, filtering and voltage stabilization;
when the motor is not operating, the load is powered by the battery module.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
(1) on the basis of fully knowing the internal structure of the underground motor and the power supply requirement of the instrument, the invention combines the characteristic of the self electrification of the winding when the underground motor operates, selects to directly take power from the winding of the motor, can reduce the volume of a power device and reduce the cost due to lower voltage level, and supplies power to the underground instrument through the battery when the motor does not work, thereby realizing stable power supply with low cost and long time.
(2) According to the invention, the power is directly supplied to the motor winding, so that the loss and voltage drop caused by long cable power transmission are avoided; meanwhile, the invention is suitable for drilling or exploiting oil and gas wells with different depths, particularly oil and gas wells of medium-deep wells, and widens the application range.
(3) According to the invention, the voltage stabilizing circuit adopts a double-tube Buck-Boost circuit, so that the switching stress is smaller and the loss is lower; the control circuit adopts a voltage and current double-loop control system based on average current, and has higher dynamic response speed and higher power factor compared with a common single-voltage-loop control system in the prior art.
(4) The invention prevents the current from flowing backwards and burning out the battery by connecting the diode in series at the output end of the battery module.
Drawings
FIG. 1 is a schematic structural diagram of an underground DC power supply device according to the present invention;
FIG. 2 is a schematic diagram of a specific structure of the downhole DC power supply apparatus provided in the present invention;
FIG. 3 is a circuit diagram of a middle tap power supply circuit of a motor winding provided by the present invention;
FIG. 4 is a circuit diagram of a dual three-phase motor power supply circuit provided by the present invention;
FIG. 5 is a schematic diagram of a three-phase bridge type uncontrolled rectifying filter circuit according to the present invention;
FIG. 6 is a diagram of a voltage regulator circuit according to the present invention;
FIG. 7 is a circuit diagram of a voltage regulation control circuit provided by the present invention;
fig. 8 is a circuit diagram of a battery provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 in conjunction with fig. 2, the present invention provides a downhole dc power supply apparatus, comprising: the power supply module, the rectification and filtering module, the voltage stabilization control module and the battery module.
The power taking module extracts alternating current voltage from a stator winding of the motor and transmits the alternating current voltage to the rectification filtering module;
the rectification filtering module converts the alternating voltage into direct voltage and transmits the direct voltage to the voltage stabilization control module;
and the direct-current voltage signal output by the voltage stabilization control module and the direct-current voltage signal output by the battery module are transmitted to a load in parallel, so that the load is supplied with power uninterruptedly.
It should be noted that the loads referred to in the present invention include logging instruments, micromotors, and the like.
Specifically, two ways of getting electricity from the motor winding are included, one is a motor with a stator winding provided with a middle tap, and the other is getting electricity from the middle tap of the winding, as shown in fig. 3; the other is a motor with two or more sets of windings on the stator, the windings are electrically isolated from each other, and an independent set of windings is used for providing alternating current, as shown in fig. 4. Compared with the prior art of wired power supply and turbine generator power supply, the voltage taken from the middle tap of the motor winding or the independent low-voltage winding is lower, so that the subsequent power conversion circuit is smaller in size and lower in cost correspondingly.
Further, the rectification and filtering module comprises a rectification circuit and a filtering circuit, wherein the rectification circuit converts alternating current electric energy into direct current, and the uncontrolled rectification can be utilized, and a controllable or semi-controllable rectification circuit can also be utilized; the controllable rectifying circuit comprises a phase-control rectifying circuit using a thyristor of a semi-control type switching device and a high-frequency rectifying circuit using a full-control type switching device. And then an inductance capacitance filter circuit filters alternating current components in the rectified output voltage current. Fig. 5 shows a three-phase uncontrolled rectifying and filtering circuit.
Further, the rectified and filtered voltage enters a voltage stabilizing and controlling circuit thereof for voltage stabilizing control. The control mode of the power switch tube adopts a pulse width modulation technology, and the pulse width controller is excited by sampling the output voltage, so that the width, namely the duty ratio, of the pulse applied to the switch adjusting tube is changed, the on-off time ratio of the switch tube is adjusted, and the output voltage is adjusted. The voltage stabilizing circuit adopts a double-tube Buck-Boost circuit, has smaller switching stress and lower loss, and is not limited to the circuit in practical application as shown in figure 6. Compared with a single voltage ring control system commonly used in the prior art, the double-loop control system based on average current control has faster dynamic response speed and higher power factor, as shown in fig. 7.
Furthermore, a high-temperature lithium battery or a lead-acid battery is connected in parallel with the rectified and stabilized direct current output to supply power to the underground instrument uninterruptedly. The specific circuit is shown in fig. 8. When the submersible motor does not work and cannot take electricity from the motor winding, the battery starts to supply power for the underground instrument, and stable and continuous power supply is realized. The output end of the battery can be connected with a diode in series to prevent the current from flowing backwards and burning out the battery.
The invention also provides an underground direct current power supply method, which adopts the underground direct current power supply device and comprises the following steps: when the motor works, the motor obtains electricity from a stator winding of the motor, and supplies power to the load after rectification, filtering and voltage stabilization; when the motor is not operating, the load is powered by the battery module.
The prior art has only considered the source of downhole tool power, such as batteries, surface power and turbine generators, from outside the motor system and has not been designed with the structural and performance characteristics inside the downhole motor. The invention combines the characteristic that the winding is electrified when the underground motor operates, selects to directly take power from the motor winding, thereby saving long cable power transmission, reducing the size of a power device and the cost due to lower voltage level, and simultaneously realizing low-cost and long-time stable power supply by supplying power to the underground instrument through the battery when the motor does not work.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A downhole dc power supply, comprising: the power supply module, the rectification filter module, the voltage stabilization control module and the battery module are connected in series;
the power taking module extracts alternating current voltage from a stator winding of the motor and transmits the alternating current voltage to the rectification filtering module;
the rectification filtering module converts the alternating voltage into direct voltage and transmits the direct voltage to the voltage stabilization control module;
and the direct-current voltage output by the voltage stabilization control module and the direct-current voltage output by the battery module are transmitted to a load in parallel, so that the load is supplied with power uninterruptedly.
2. The downhole DC power supply of claim 1,
when a stator winding of the motor is provided with a middle tap, the electricity taking module extracts alternating-current voltage from the middle tap;
when the stator of the motor is provided with two or more sets of windings and the windings are mutually and electrically isolated, the power taking module extracts alternating-current voltage from one set of windings.
3. The downhole DC power supply of claim 1 or 2,
the rectification and filtering module comprises a rectification circuit and a filtering circuit, and the rectification circuit is an uncontrollable rectification circuit or a controllable rectification circuit or a semi-controllable rectification circuit; the filter circuit is an inductance-capacitance filter circuit and is used for filtering alternating current components in the rectified output voltage.
4. The downhole DC power supply of claim 1 or 2,
the voltage stabilizing control module comprises a voltage stabilizing circuit and a control circuit, the voltage stabilizing circuit is a double-tube Buck-Boost circuit, and the control circuit adopts double-loop control of voltage and current based on average current.
5. The downhole DC power supply of claim 1 or 2,
the battery module is a high-temperature lithium battery or a lead-acid battery.
6. The downhole DC power supply of claim 5,
and the output end of the battery module is connected with the load after being connected with a diode in series.
7. A downhole DC power supply method using the downhole DC power supply device according to any one of claims 1 to 6, comprising:
when the motor works, the motor obtains electricity from a stator winding of the motor, and supplies power to the load after rectification, filtering and voltage stabilization;
when the motor is not operating, the load is powered by the battery module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011130510.2A CN112234706A (en) | 2020-10-21 | 2020-10-21 | Underground direct current power supply device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011130510.2A CN112234706A (en) | 2020-10-21 | 2020-10-21 | Underground direct current power supply device and method |
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| Publication Number | Publication Date |
|---|---|
| CN112234706A true CN112234706A (en) | 2021-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011130510.2A Pending CN112234706A (en) | 2020-10-21 | 2020-10-21 | Underground direct current power supply device and method |
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| CN (1) | CN112234706A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201726252U (en) * | 2010-07-20 | 2011-01-26 | 华中科技大学 | Underground power supply |
| US20140001765A1 (en) * | 2012-07-01 | 2014-01-02 | Michael Kramer | Variable attractive force motor and generator |
| CN107060733A (en) * | 2017-06-12 | 2017-08-18 | 哈尔滨理工大学 | Down-hole information time-sharing acquisition device and method during latent oil reciprocating oil pumping unit intermittent duty |
| CN111277041A (en) * | 2020-02-09 | 2020-06-12 | 郑州科技学院 | Dual-power automatic transfer switch and control method thereof |
-
2020
- 2020-10-21 CN CN202011130510.2A patent/CN112234706A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201726252U (en) * | 2010-07-20 | 2011-01-26 | 华中科技大学 | Underground power supply |
| US20140001765A1 (en) * | 2012-07-01 | 2014-01-02 | Michael Kramer | Variable attractive force motor and generator |
| CN107060733A (en) * | 2017-06-12 | 2017-08-18 | 哈尔滨理工大学 | Down-hole information time-sharing acquisition device and method during latent oil reciprocating oil pumping unit intermittent duty |
| CN111277041A (en) * | 2020-02-09 | 2020-06-12 | 郑州科技学院 | Dual-power automatic transfer switch and control method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 潘永雄: "《开关电源技术与设计》", 29 February 2016 * |
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Application publication date: 20210115 |